US7315236B2 - Monitoring device for monitoring electronic control units on a vehicle - Google Patents

Monitoring device for monitoring electronic control units on a vehicle Download PDF

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Publication number
US7315236B2
US7315236B2 US11/183,758 US18375805A US7315236B2 US 7315236 B2 US7315236 B2 US 7315236B2 US 18375805 A US18375805 A US 18375805A US 7315236 B2 US7315236 B2 US 7315236B2
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Prior art keywords
monitoring
power line
electronic control
ecu
unit
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Expired - Fee Related, expires
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US11/183,758
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US20060017584A1 (en
Inventor
Yo Yanagida
Naoyuki Shiraishi
Atsushi Kawamura
Terumitsu Sugimoto
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Yazaki Corp
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Yazaki Corp
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Assigned to YAZAKI CORPORATION reassignment YAZAKI CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KAWAMURA, ATSUSHI, SHIRAISHI, NAOYUKI, SUGIMOTO, TERUMITSU, YANAGIDA, YO
Publication of US20060017584A1 publication Critical patent/US20060017584A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R25/00—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles
    • B60R25/10—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles actuating a signalling device
    • B60R25/1004—Alarm systems characterised by the type of sensor, e.g. current sensing means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R25/00—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles
    • B60R25/01—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles operating on vehicle systems or fittings, e.g. on doors, seats or windscreens
    • B60R25/04—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles operating on vehicle systems or fittings, e.g. on doors, seats or windscreens operating on the propulsion system, e.g. engine or drive motor

Definitions

  • the present invention relates to a monitoring device for monitoring a connection between respective electronic control units (ECU) on a vehicle and power lines for supplying power to the ECU (ECU monitoring device hereinafter).
  • ECU monitoring device for monitoring a connection between respective electronic control units (ECU) on a vehicle and power lines for supplying power to the ECU
  • an immobilizer system includes an ignition key having a transponder built-in, an immobilizer ECU, an engine ECU and so on.
  • the immobilizer system is constructed so as to judge whether or not a vehicle is being used falsely by transmitting/receiving a code signal among the above constituents.
  • Such a constitution is disclosed in Japanese Patent Publication Laid-open No. 8-30873.
  • the immobilizer system breaks down. That is, it means that the immobilizer system cannot detect a vehicle being improperly used, so that it becomes impossible to protect the vehicle against theft.
  • a junction box (J/B) ECU 101 is connected to an immobilizer ECU 102 through an exclusive line L 101 .
  • the immobilizer ECU 102 is connected to the junction box (J/B) ECU 101 .
  • the voltage of the line L 101 is at a low level, it is judged that the exclusive line 101 is in the normal connection. While, if the voltage of the line L 101 is at a high level, it is judged that the immobilizer ECU 102 is disconnected from the junction box (J/B) ECU 101 falsely.
  • the system is apt to be large-sized due to the need of providing the exclusive line L 101 for monitoring the connection, causing the installation cost to be elevated.
  • the same system is formed so as to detect a direct-current (DC) voltage, it is untreatable to a thieving procedure of first connecting the line L 101 to a ground and subsequently detaching the immobilizer ECU 102 from the system.
  • DC direct-current
  • the junction box (J/B) ECU 101 is connected to the immobilizer ECU 102 through a power line L 102 .
  • a value of the dark current is a few ( ⁇ A)
  • a value of the dark current is 0 ( ⁇ A)
  • the junction box (J/B) ECU 101 is connected to the immobilizer ECU 102 through a CAN communication line L 103 .
  • the communication line L 103 is connected between the junction box (J/B) ECU 101 and the immobilizer ECU 102 normally, then it is judged that the CAN communication is being performed normally. While, if the communication line L 103 is cut off, it is judged that the immobilizer ECU 102 is detached from the system due to disruption in communication.
  • an object of the present invention to provide an ECU monitoring device for monitoring ECU mounted on a vehicle, which is capable of detecting a situation that an immobilizer ECU is detached from a vehicle, with high accuracy so as to allow an owner's vehicle to be protected against theft.
  • a ECU monitoring device for monitoring a connection between electronic control units mounted on a vehicle, comprising: a main battery; a power line connecting the main battery with an electronic control unit to be monitored, thereby supplying the electronic control unit with a power of the main battery; and a monitoring unit connected to the power line, wherein the monitoring unit includes: a monitoring-signal generating unit for superimposing a monitoring signal on the power line connecting the main battery with the electronic control unit to be monitored; a monitoring-signal detecting unit for detecting the monitoring signal superimposed on the power line; and a judging unit for judging the presence of at least one connection between the power line and the electronic control unit to be monitored or connection between the power line and a false instrument, based on a level of the monitoring signal detected by the monitoring-signal detecting unit.
  • the monitoring-signal generating unit superimposes the monitoring signal on the power line, while the monitoring-signal detecting unit detects the monitoring signal superimposed on the power line.
  • the judging unit judges the presence of at least either one connection between the power line and the electronic control unit to be monitored, such as immobilizer ECU, or another connection between the power line and a false instrument.
  • the judging unit compares the level of the monitoring signal with a first threshold value pre-determined; the judging unit judges that the electronic control unit to be monitored is in a normal condition when the level of the monitoring signal is smaller than the first threshold value; and the judging unit judges that the electronic control unit to be monitored is disconnected from the power line when the level of the monitoring signal is equal to or larger than the first threshold value.
  • comparing a level of the detected signal with the first threshold value it is judged that the electronic control unit to be monitored is in a normal condition when the level of the monitoring signal is smaller than the first threshold value and that the electronic control unit to be monitored has been disconnected from the power line when the level of the monitoring signal is equal to or larger than the first threshold value. Therefore, the judgment with high accuracy can be accomplished and further, when a theft occurs, it is possible to inform the circumference about a vehicle of the occurrence.
  • the judging unit compares the level of the monitoring signal with a second threshold value smaller than the first threshold value, and the judging unit judges that the electronic control unit to be monitored has been connected to the false instrument when the level of the monitoring signal is smaller than the second threshold value.
  • comparing a level of the detected signal with the second threshold value it is judged that no false instrument is connected to the power line when the level of the monitoring signal is equal to or more than the second threshold value and that a false instrument is connected to the power line when the level of the monitoring signal is smaller than the second threshold value. Therefore, the judgment with high accuracy can be accomplished and further, when a theft occurs, it is possible to inform the circumference about a vehicle of the occurrence.
  • the monitoring signal comprises high-frequency signals outputted intermittently.
  • the detecting accuracy can be improved with a reduction in the power consumption.
  • the ECU monitoring device further comprises a backup battery for supplying the monitoring unit with a driving power.
  • the ECU monitoring device further comprises an alarm unit that generates an alarm signal when it is detected that the electronic control unit to be monitored is disconnected from the power line.
  • the judging unit further stops a drive of an engine electronic control unit for controlling a drive of an engine when the judging unit judges that the electronic control unit to be monitored is disconnected from the power line or that the electronic control unit to be monitored is connected to the false instrument.
  • the electronic control unit to be monitored comprises an immobilizer electronic control unit for protecting the vehicle against theft.
  • FIG. 1 is a block diagram showing the constitution of an ECU monitoring device as a first example in the conventional art
  • FIG. 2 is a block diagram showing the constitution of an ECU monitoring device as a second example in the conventional art
  • FIG. 3 is a block diagram showing the constitution of an ECU monitoring device as a third example in the conventional art
  • FIG. 4 is a block diagram showing the constitution of an ECU monitoring device in accordance with an embodiment of the present invention.
  • FIG. 5 is a flow chart showing the operation of the ECU monitoring device in accordance with the embodiment of the present invention.
  • FIG. 6 is a timing chart showing the change of a high-frequency signal and the changes of other signals when an immobilizer ECU is detached from the device.
  • FIG. 7 is a timing chart showing the change of a high-frequency signal and the changes of other signals when an instrument is attached to a power line.
  • FIG. 4 is a block diagram showing the constitution of an ECU monitoring device of an embodiment of the present invention.
  • the ECU monitoring device includes a monitoring electronic control unit (ECU) 2 , a backup power source B 2 and an alarm unit 3 .
  • the monitoring ECU 2 which may be formed by a junction box (J/B) ECU is connected to a power line L 1 connecting a main battery B 1 mounted on a vehicle (not shown) with an immobilizer ECU 1 to be monitored.
  • the backup power source B 2 is provided to supply the monitoring ECU 2 with backup power when the power supply from the main battery B 1 is stopped.
  • the alarm unit 3 outputs an alarm signal when it is detected that the immobilizer ECU 1 is disconnected from the power line L 1 .
  • the main battery B 1 is also connected to the power line L 1 through a power-off device 4 , while the power line L 1 is connected to the immobilizer ECU 1 .
  • the immobilizer ECU 1 is energized by electrical power supplied from the main battery B 1 .
  • a fuse F is interposed in the power line L 1 in order to protect a circuit of the immobilizer ECU 1 at an occurrence of overcurrent.
  • the main battery B 1 is also connected to other electronic control units (ECUs) besides the immobilizer ECU 1 , for example, an engine ECU 5 for controlling the drive of an engine (not shown) generally.
  • the engine ECU 5 is connected to an engine ignition unit (ignitor) 6 and a fuel pump 7 to control their operations.
  • the immobilizer ECU 1 has a power unit la for converting a voltage supplied from the main battery B 1 to a predetermined level of voltage and a central processing unit (CPU) 1 b for controlling the immobilizer ECU 1 as a whole.
  • a power supply terminal connected to the power line L 1 is provided with a bypass condenser C 1 .
  • the monitoring ECU 2 includes a high-frequency signal generating circuit 21 , a high-frequency signal detecting circuit 22 , a power unit 23 , a CPU 24 and a connector 25 .
  • the high-frequency signal generating circuit 21 superimposes a high-frequency signal (i.e. monitoring signal of e.g. 2.5 MHz) on the power line L 1 , constituting a monitoring-signal generating unit of the invention.
  • the high-frequency signal detecting circuit 22 detects the high-frequency signal superimposed on the power line L 1 , constituting a monitoring-signal detecting unit of the invention.
  • the power unit 23 converts a voltage supplied from the main battery B 1 or the backup power source B 2 into a desired voltage and further supplies respective components of the monitoring ECU 2 with drive power.
  • the CPU 24 outputs a drive command signal to the high-frequency signal generating circuit 21 and further judges whether the immobilizer ECU 1 is disconnected from the power line L 1 or whether a false unit is connected to the power line L 1 , based on the high-frequency signal detected by the high-frequency signal detecting circuit 22 . Note, the CPU 24 does constitute a judging unit of the invention.
  • the connector 25 forms a joint part for the above-mentioned constituents of the monitoring ECU 2 .
  • FIG. 5 is a flow chart explaining the operation of the ECU monitoring device.
  • FIGS. 6 and 7 are timing charts explaining the operation of the ECU monitoring device.
  • step ST 1 when the main battery B 1 is connected to the power line L 1 and further, the backup power source B 2 is connected to the monitoring ECU 2 to activate the whole system, in other words, if the judgment at step ST 1 is Yes, then the routine goes to step ST 2 where it is judged whether a vehicle is now parking or not.
  • the judgment whether or not the vehicle is now parking is enabled by information about the operation of the engine, which is brought from the engine ECU 5 .
  • step ST 2 If the vehicle is parking (Yes at step ST 2 ), then the routine goes to step ST 3 where the high-frequency signal generating circuit 21 outputs high-frequency signals intermittently as shown with FIG. 6 ( a ). The outputted high-frequency signals are superimposed on the power line L 1 .
  • step ST 4 it is executed to detect the superimposed high-frequency signals by the high-frequency signal detecting circuit 22 .
  • step ST 5 the CPU 24 compares respective levels of the detected high-frequency signals with a first threshold value Th 1 determined in advance. Now, if it is judged that the level of the detected signal is smaller than the first threshold value Th 1 (Yes at step ST 5 ), the routine goes to step ST 7 where is it executed to further compare the level of the detected signal with a second threshold value Th 2 determined in advance. Note, the first threshold value Th 1 is set larger than the second threshold value Th 2 (i.e. Th 2 ⁇ Th 1 ).
  • step ST 7 If it is judged that the level of the detected signal is equal to or more than the second threshold value Th 2 (Yes at step ST 7 ), then the routine goes to step ST 9 where it is judged that the immobilizer ECU 1 is connected with the power line L 1 normally. Subsequently, the routine is returned to step ST 1 .
  • step ST 5 if the level of the detected signal is equal to or larger than the first threshold value Th 1 (No at step ST 5 ), the routine goes to step ST 6 where it is judged that the immobilizer ECU 1 is being disconnected from the power line L 1 . Then, the routine goes to step ST 10 where it is executed to allow the alarm unit 3 to generate an alarm signal.
  • step ST 7 if it is judged that the level of the signal is smaller than the second threshold value Th 2 (No at step ST 7 ), the routine goes to step ST 8 to judge that the other instrument is attached to the power line L 1 falsely and subsequently goes to step ST 10 to output the alarm signal by the alarm unit 3 .
  • the immobilizer ECU 1 is detached from the device by thieving false manipulations or when a false instrument is connected to the power line L 1 by the same manipulations, the device of the invention can detect such a situation certainly and output the alarm signal to the outside.
  • the immobilizer ECU 1 is detached from the power line L 1 by false manipulations, the high-frequency signals superimposed on the power line L 1 have amplitudes of vibration similar to those of the signals outputted from the high-frequency generating circuit 21 since the bypass condenser C 1 is cut off from the power line L 1 together with the immobilizer ECU 1 , as shown with a mark X 2 in FIG. 6 ( c ).
  • the monitoring ECU 2 detects such falseness [see FIG. 6 ( c )]. Simultaneously, the power-off device 4 is activated so as to cut off power supply by the monitoring ECU 2 , as shown in FIG. 6 ( d ). Additionally, the monitoring ECU 2 outputs a “standstill” command signal to the engine ECU 5 , as shown in FIG. 6 ( e ).
  • the engine ECU 5 is brought into a standstill condition and furthermore, the power for driving is not supplied from the main battery B 1 . In this state, anyone cannot start up the engine. Simultaneously, the alarm signal is generated from the alarm unit 3 , so that a situation where the vehicle may be being stolen by thieving is informed to the circumference around the vehicle.
  • the electrical potential of the same line L 1 is lowered.
  • the waveforms of the high-frequency signals detected by the high-frequency signal detecting circuit 22 have remarkably small amplitudes of vibration, as shown in a mark Y 2 in FIG. 7 ( b ).
  • the high-frequency signal detecting circuit 22 it is detected that the levels of the signals are smaller than the second threshold value Th 2 .
  • the monitoring ECU 2 above all, the CPU 24 judges that any false instrument has been attached to the power line L 1 [see FIG. 7 ( c )].
  • the power-off device 4 is activated so as to cut off power supply by the monitoring ECU 2 , as shown in FIG. 7 ( d ). Additionally, the monitoring ECU 2 outputs the “standstill” command signal to the engine ECU 5 , as shown in FIG. 7 ( e ).
  • the engine ECU 5 is brought into a standstill condition and furthermore, the power for driving is not supplied from the main battery B 1 . In this state, anyone cannot start up the engine. Simultaneously, the alarm signal is generated from the alarm unit 3 , so that a situation where the vehicle may be being stolen by a thief is informed to the circumference around the vehicle.
  • the level of a high-frequency signal superimposed on the power line L 1 varies dependently of the number of instrument to be connected with the power line L 1 .
  • the ECU monitoring device of the invention is capable of outputting an alarm signal at a point of time before the vehicle is stolen.
  • the high-frequency signals are superimposed on the power line L 1 connecting the main battery B 1 with the immobilizer ECU 1 and the resultant superimposed signals are detected. Further, based on the magnitudes of the levels of the so-detected high-frequency signals, the device judges whether or not false manipulation are being performed by a theft. Accordingly, it is possible to detect false manipulations certainly, whereby the theft of a vehicle can be prevented.
  • an alarm signal is generated upon the judgment that the immobilizer ECU 1 has been detached from the power line L 1 .
  • the alarm signal is also generated upon the judgment that a false instrument has been attached to the power line L 1 . Therefore, it is possible to prevent various false manipulations for breaking down the function of an immobilizer, improving the antitheft capability of the device remarkably.
  • the intermittent high-frequency signals are employed as monitoring signals to be superimposed on the power line L 1 , it is possible to detect any change in the level of the high-frequency signal(s) with high accuracy and also possible to reduce an electric power consumption of the device.
  • the ECU monitoring device of the embodiment is equipped with the backup battery B 2 , even if the main battery B 1 were disconnected from the power line L 1 , the monitoring ECU 2 could be operated certainly, allowing prevention of the theft of a vehicle.
  • the alarm unit 3 may be in the form of operating an automotive horn or lighting a winker lamp built in the vehicle.
  • the ECU monitoring device of the invention is not structured so as to adopt a standard protocol like the conventional CAN communication system, it precludes such a false manipulation as reading data with the use of a commercial instrument, whereby the antitheft capability of the device can be improved. As there is no need to arrange an exclusive line for detecting the false manipulations, the circuitry of the device can be simplified. Additionally, since the high-frequency signals superimposed on the power line L 1 have weak abdominal pressures, the ECU monitoring device of the invention can exhibit high concealment.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Burglar Alarm Systems (AREA)
US11/183,758 2004-07-21 2005-07-19 Monitoring device for monitoring electronic control units on a vehicle Expired - Fee Related US7315236B2 (en)

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JP2004-212794 2004-07-21
JP2004212794A JP2006027550A (ja) 2004-07-21 2004-07-21 車載ｅｃｕの監視装置

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Cited By (7)

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US20060069479A1 (en) * 2004-09-28 2006-03-30 Fuji Jukogyo Kabushiki Kaisha Control apparatus for a vehicle equipment device
US20080157941A1 (en) * 2005-12-14 2008-07-03 Siemens Vdo Automotive Ag Electronic Device to Be Incorporated Into a Motor Vehicle in Order to Help Retrieve the Device Following a Theft
US20100097186A1 (en) * 2008-10-17 2010-04-22 Rockwell Automation Technologies, Inc. User interface devices for control of machine systems
US20100121547A1 (en) * 2007-08-10 2010-05-13 Bayerische Motoren Werke Aktiengesellschaft Electromechanical Parking Brake for a Motor Vehicle
US20100228425A1 (en) * 2009-03-05 2010-09-09 Denso Corporation Vehicle communication apparatus
US20100304683A1 (en) * 2009-05-28 2010-12-02 Rockwell Automation Technologies, Inc. Wireless user interface system performance monitoring
US20130138299A1 (en) * 2011-11-24 2013-05-30 Mando Corporation Power steering apparatus capable of sensing moisture

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JP4962022B2 (ja) * 2007-01-26 2012-06-27 トヨタ自動車株式会社 シフト切換機構の制御装置
JPWO2009075021A1 (ja) * 2007-12-10 2011-04-28 パイオニア株式会社 情報処理装置、機能動作制御方法、機能動作制御プログラム及びその記録媒体
US9019113B2 (en) * 2009-10-13 2015-04-28 Sennco Solutions, Inc. Circuit, system and/or method for detecting an electrical connection between an electrical device and a power supply
JP5675322B2 (ja) * 2010-12-22 2015-02-25 エイディシーテクノロジー株式会社 移動検出装置
DE102012101836B4 (de) 2012-03-05 2014-07-17 Oliver Lünstedt Mobilfunk-basierte zusätzliche elektronische Wegfahrsperre mit Türöffner mit Diebstahlalarm
WO2014034710A1 (ja) * 2012-08-29 2014-03-06 株式会社ホンダアクセス 車両に設けられたバッテリを監視するシステム
JP6026223B2 (ja) 2012-10-25 2016-11-16 矢崎総業株式会社 電子キーシステム
DE102014207810A1 (de) * 2014-04-25 2015-10-29 Bayerische Motoren Werke Aktiengesellschaft Verfahren und Vorrichtung zum Betreiben eines Kraftfahrzeugs
CN106707817B (zh) * 2016-12-30 2019-09-27 上海华兴数字科技有限公司 一种动态匹配防拆方法及挖掘机

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Publication number Priority date Publication date Assignee Title
US20060069479A1 (en) * 2004-09-28 2006-03-30 Fuji Jukogyo Kabushiki Kaisha Control apparatus for a vehicle equipment device
US20080157941A1 (en) * 2005-12-14 2008-07-03 Siemens Vdo Automotive Ag Electronic Device to Be Incorporated Into a Motor Vehicle in Order to Help Retrieve the Device Following a Theft
US8138898B2 (en) * 2005-12-14 2012-03-20 Siemens Vdo Automotive Ag Electronic device to be incorporated into a motor vehicle in order to help retrieve the device following a theft
US20100121547A1 (en) * 2007-08-10 2010-05-13 Bayerische Motoren Werke Aktiengesellschaft Electromechanical Parking Brake for a Motor Vehicle
US8359136B2 (en) * 2007-08-10 2013-01-22 Bayerische Motoren Werke Aktiengesellschaft Electromechanical parking brake for a motor vehicle
US20100097186A1 (en) * 2008-10-17 2010-04-22 Rockwell Automation Technologies, Inc. User interface devices for control of machine systems
US9207664B2 (en) 2008-10-17 2015-12-08 Rockwell Automation Technologies, Inc. User interface devices for control of machine systems
US10146210B2 (en) 2008-10-17 2018-12-04 Rockwell Automation Technologies, Inc. Wireless push button assembly for industrial automation environments
US20100228425A1 (en) * 2009-03-05 2010-09-09 Denso Corporation Vehicle communication apparatus
US8204644B2 (en) 2009-03-05 2012-06-19 Denso Corporation Vehicle communication apparatus
US20100304683A1 (en) * 2009-05-28 2010-12-02 Rockwell Automation Technologies, Inc. Wireless user interface system performance monitoring
US8571486B2 (en) * 2009-05-28 2013-10-29 Rockwell Automation Technologies, Inc. Wireless user interface system performance monitoring
US8892055B2 (en) 2009-05-28 2014-11-18 Rockwell Automation Technologies, Inc. Wireless user interface system performance monitoring
US20130138299A1 (en) * 2011-11-24 2013-05-30 Mando Corporation Power steering apparatus capable of sensing moisture
US9020703B2 (en) * 2011-11-24 2015-04-28 Mando Corporation Power steering apparatus capable of sensing moisture

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US20060017584A1 (en) 2006-01-26
DE102005034117A1 (de) 2006-03-16
DE102005034117B4 (de) 2008-05-08
JP2006027550A (ja) 2006-02-02

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